RESTORING FORCE CHARACTERISTICS OF PRECAST CONCRETE BEAMS POST-TENSIONED BY UNBONDED TENDONS AT WIDENED BEAM END

Modeling on restoring force characteristics of unbonded precast prestressed concrete beams with widened beam end was proposed in this paper. One model has rotational springs at both the outer end of the general and widened beam end, and another model has one spring with a rigid zone at the end. Ten unbonded precast prestressed concrete beams whose parameters are beam longitudinal rebar amount, widened beam end size, prestressing force, etc., were constructed and tested. The proposed method captured the restoring force characteristics of the test results in good accuracy.